Q 12-04-135JEE MainJEE Main 2023 (10 Apr, Shift 1)Easy
Given below are two statements:
**Statement I:** If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double.
**Statement II:** Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio.
In the light of the above statements, choose the correct answer from the options given below.
Answer: (A) Statement I is true but Statement II is false
Current sensitivity $\dfrac{NAB}{k}\propto N$ (I true). Doubling $N$ also doubles the coil resistance, so the voltage sensitivity $\dfrac{NAB}{kR}$ is unchanged (II false).
Solution by Sreeraj P, M.Sc Physics